Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fb20cf174b2382…

MALICIOUS

PDF

94.0 KB Created: 2021-04-06 18:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1f20a616989b76cfc32e1471e1f0f0 SHA-1: cfeb3c31183389cdb5087af1572fec0cc522ae22 SHA-256: 01fb20cf174b2382ab47b26f2d02d12dffb013d4573523a6f4f83eb9ea0e7a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of embedded external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing campaign. The presence of these links and the overall structure strongly indicate an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wix?keyword=what+is+a+text+mail+subscriber+on+craigslist
    • http://sbrf.link/6060808209384hi4.pdf
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ff2f2f5b8108.pdf
    • http://skidki-day.site/49239807094cama0.pdf
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/6c7c8216ed.pdf
    • http://1fps.ru/whirlpool_gold_series_fridge_troubleshootingcgex2.pdf
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/nolodikefiluzezegutu.pdf
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/fobejad-fevav-dalenipe.pdf
    • https://cdn-cms.f-static.net/uploads/4495838/normal_601a4f2fc1e9f.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fd68ae7a5016.pdf
    • http://adanakebap.org/50863085681r8rw2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5d93b929-573d-4b82-873f-3540ccb85bc3/what_is_error_79_on_hp_printer.pdf
    • https://uploads.strikinglycdn.com/files/57a4719e-6761-4762-893c-1406b44d451f/67104619264.pdf
    • https://uploads.strikinglycdn.com/files/d74a6e57-71a6-490d-b4f9-f4d5da7e443d/wildgame_innovations_terra_extreme_trail_camera__12mp.pdf
    • https://uploads.strikinglycdn.com/files/e0b77b5b-f454-4625-8880-bcb7e0babe46/mcgraw_hill_act_practice_test_2_answers.pdf
    • https://uploads.strikinglycdn.com/files/6964f926-0e48-475e-aa57-c058997b0d20/the_holy_quran_book_online.pdf
    • https://uploads.strikinglycdn.com/files/503e0251-bf87-4f84-b8fc-766600306ce4/82521887850.pdf
    • https://uploads.strikinglycdn.com/files/2373dc60-104e-46c1-9be9-cb9cc05a6b0a/30486991410.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001235d.bin
ee784c0dae63acc34a1f04d092e77ef58b0f60d68c8604ad2d5777356447e9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 3440 bytes
font_01_sfnt_off00012f9a.bin
b79e9562f67b0f027d5d747f022a39d21f187f5f28bee5641af95c55d76bac32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 5436 bytes
font_02_sfnt_off000141f9.bin
eecdfedc48c5dbaa26f75398bb8869d011e31b5c9c8539dc1d68bab1ff0553ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141F9 12168 bytes

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